There are jDM extensions developed to catch downloads(which you like to be downloaded with jDM) from Safari,Google Chrome and Firefox browsers. You can also add downloads with right click on link and choose 'Download With jDM'.

Schedule downloads: choose specific time when to start and stop downloads and when downloads are finished option to shut down Mac or put Mac on sleep mode or quit jDM. Automatic restart for timed out downloads.You can configure jDM: when to remove completed downloads from list, resume existing file when duplicate link is added. Save username and password for different hosts

Limit maximum simultaneous downloads, if more downloads are added, jDM puts them into waiting list, if any download completes, jDM will automatically resume next file with waiting status.​

You can add downloads by copy/paste, drag & drop. Directly open files from jDM or drag & drop files from jDM, show in Finder, re-download,know in advance whether download supports resume.